Rotary abrading brush



May 19, 1925; 1,538,220

L. B. sHULTz l Filed June l5, 1922 Patented May 19, 1925.

UNITED STATES PATENT OFFICE.

OF ST. LOUIS, MISSOURI, ASSIGNOR TO PILLEY PACKING &

FLUE BRUSH 'MANUFACTURING COMPANY, 0F ST. LOUIS, MISSOURI, A CORPORA- BOTARY ABRADIN G BRUSH.

To all whom t may concern.'

Be it known that I, LLEWELLYN B. SHULTZ, a citizen of the United States of America, residing at the city of St. Louis, 6 State of Missouri, United States of America, have invented a certain new and useful Rotary Abrading Brush, of which the following is such a full, clear, and exact description as will enable anyone skilled in l0. the art to which it appertains to make and use the same,

reference being had to the accompanying drawings,

forming part of this specification.

My invention relates'to a rotary rabrading brush suitable for removing carbon from the cylinders of internal combustion engines, for removing paint and rust from iron structures, and other similar purposes.

One object of my invention is to rovide sim le and effective means for varying the lsti ness of the brush. Another object of my invention is to so form the brush that the pressure of the working face against the article operated upon will tend to equalize the stiffness of the wires throughout the area of the working face. Another object of m invention is to provide means for readi y renewing the wire portion or tuft of the brush.

In the accompanying drawings which illustrate one form of brush made in accordance with m invention, Figure 1 is a side elevation, igure 2 is a longitudinal central section,

and Figure 3 is a section 5 taken onf the line 3-3 of Figure 2.

5 indicates a cylindrical core or plug in one end of which is suitably secured a steel shank 6 by means of which the brush may be secured in an actuating chuck, as for exl ample, the chuck of a drill press, or a chuck carried by a flexible shaft so that the brush may be used as a hand tool. The exterior of the plug 5 is screw threaded to cooperate with corresponding screw threads on the interior of a sleeve 7 which sleeve operates to vary the stiffness of the brush as will be hereafter more fully pointed out.

The plug 5 is provided with a central aperture 8, the lower end of which is threaded to receive the upper threaded end 9 of a stem or Support 10. This stem 10 is composed "of a plurality of rods, preferably four in cave as shown in Figure 2 of number, twisted together with interposed steel wires 11. Thls structure provides a conical abrading tuft, the wires of which progressively increase in length from the center to the periphery. The working end of the tuft 11 is formed to be normally conthe drawings.

The operation of my brush is as follows:

The brush is actuated by being held in any Suitable rotating chuck and the concave face 12 is forced against the article to be abraded. Owing to the form of the face the outer wires will come in contact with the surface to be abraded before the inner wires and consequently the outer wires will be, bent so that these wires, which are longer and 'naturally more iiexible than shorter wires,

will have their tension increased to more evenly distribute the abrading effect throughout the entire working face of the brush. By moving the sleeve 7 longitudinally which is accomplished by rotating it, the angle ofthe tuft 11 and the consequent stiffness of the brush as a whole can be varied to accommodate the brush to the particular class of work to which it is to be applied. I find that the contact of the inner lower edge of the sleeve with the tuft 11 effectively prevents accidental rotation of the sleeve after the adjustment has been made and consequently no additional locking means is necessary. When the tuft 11 ybecomes worn it may be renewed by simply unscrewing the stem 10 from the aperture 8 `and substituting a new tuft.

Having fully described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a rotary abrading brush, the combination with a stem consisting of a plurality of rods twisted together, of wires interposed between said rods and forming a conical abrading tuft., the end of said tuft being normally concave and means for varying its degree of concavity and consequently the working pressure of the brush.

2. In a rotary abrading brush, the combination of a plurality of rods twisted together with interposed wires forming a conical abrading tuft, said tuft having a normally concave working end, of a threaded sleeve for compressing said tuft to vary the angle of convergence of the sides of the tuft and the consequent Working pressure -of the brush.

3. In a rotary abrading brush, the combination With a plug having a central openin g and threaded cxteriorly, of a conical wlre brush provided with a stem secured in the central opening of said plug, an interiorly threaded sleeve adjustable along said plug and bearing upon the brushvto 10 vary its conical angle, and a shank carried by said plug securing the device in a. drivingr chuck.

In testimony whereof, I have hereunto set my hand and aiXed my seal.

L. B. SHUIJTZ. [11. 8.] 

